Dual-basket self-centering rotational device for treatment of arterial occlusive disease with infinitely adjustable cutting size

Abstract

An system for treating arterial occlusive disease with rotating cutting baskets whose outer diameter can be infinitely adjusted to adjust by the operator for precise excision of plaque buildup in the body vessel.

What is claimed is: 
     
       1. A device for treatment of arterial occlusive disease comprising:
 a first tubular shaft member that extends along a longitudinal axis from a proximal end to a distal end; 
 a second hollow tubular shaft member coaxial to the first tubular shaft member along the longitudinal axis and enclosed from the proximal end to the distal end, and further configured to have a constant diameter during use of the device; 
 a third hollow tubular shaft member coaxial to the first tubular shaft member and the second hollow tubular member along the longitudinal axis, enclosed from the proximal end to the distal end and configured to have a constant diameter during use of the device, the third hollow tubular shaft member being connected to a first cutting basket; and 
 a second cutting basket connected to the second hollow tubular shaft member, the second hollow tubular shaft member being connected to a rotary drive source to rotate the second cutting basket relative to the first cutting basket about the longitudinal axis, the second cutting basket and the first cutting basket being coupled to the first tubular shaft member so that translation of the first tubular shaft member along the longitudinal axis changes a diameter of the second cutting basket continuously from a first diameter to a second diameter greater than the first diameter while the second cutting basket rotates about the longitudinal axis. 
 
     
     
       2. The device of  claim 1 , in which the first cutting basket comprises at least two rotary cutting blades each defining a curvilinear thin edge member that extends along the longitudinal axis to define an arcuate edge as viewed in a sectional view taken on a plane orthogonal to the longitudinal axis. 
     
     
       3. The device of  claim 1 , in which the second cutting basket comprises at least two rotary cutting blades each defining a curvilinear thin edge member that extends along the longitudinal axis to define an arcuate edge about the longitudinal axis. 
     
     
       4. The device of  claim 1 , in which the first and second cutting baskets are comprise from a shape memory material. 
     
     
       5. The device of  claim 4 , in which the shape memory material comprises Nitinol. 
     
     
       6. The device of  claim 5 , in which the first cutting basket is heat-set to a compressed state and the second cutting basket is heat-set to an expanded and uncompressed state at or above a phase transition temperature. 
     
     
       7. The device of  claim 5 , in which both the first and second cutting baskets are heat-set to an expanded state above a phase transition temperature. 
     
     
       8. The device of  claim 1 , in which the first cutting basket is stationary. 
     
     
       9. The device of  claim 1 , in which the first cutting basket is configured to rotate in a direction opposite a direction of the second cutting basket. 
     
     
       10. The device of  claim 1 , in which saline solution is pumped through a flow passage of the first tubular shaft member to the distal end proximate the first cutting basket. 
     
     
       11. The device of  claim 10 , in which a vacuum source is coupled to an aspiration port defined by a gap formed between one of the first, second and third shaft members. 
     
     
       12. A device for treatment of arterial occlusive disease comprising:
 a first tubular shaft member that extends along a longitudinal axis from a proximal end to a distal end; 
 a second hollow tubular shaft member coaxial to the first tubular shaft member along the longitudinal axis and enclosed from the proximal end to the distal end, further configured to have a constant diameter during use of the device; 
 a third hollow tubular shaft member coaxial to the first tubular shaft member and second hollow tubular shaft member along the longitudinal axis, enclosed from the proximal end to the distal end and configured to have a constant diameter during use of the device, the third hollow tubular shaft member being connected to both a first cutting basket as well as the first tubular shaft member; and 
 a second cutting basket connected to the second hollow tubular shaft member, the second hollow tubular shaft member being connected to a rotary drive source to rotate the second cutting basket relative to the first cutting basket about the longitudinal axis the second cutting basket and the first cutting basket being coupled to the first tubular shaft member so that translation of the first tubular shaft member along the longitudinal axis changes a diameter of the second cutting basket infinitely from a first diameter to a second diameter greater than the first diameter while the second cutting basket rotates about the longitudinal axis. 
 
     
     
       13. The device of  claim 12 , in which the first cutting basket comprises at least two rotary cutting blades each defining a curvilinear thin edge member that extends along the longitudinal axis to define an arcuate edge as viewed in a sectional view taken on a plane orthogonal to the longitudinal axis. 
     
     
       14. The device of  claim 12 , in which the second cutting basket comprises at least two rotary cutting blades each defining a curvilinear thin edge member that extends along the longitudinal axis to define an arcuate edge about the longitudinal axis. 
     
     
       15. The device of  claim 12 , in which the first and second cutting baskets are comprise from a shape memory material. 
     
     
       16. The device of  claim 15 , in which the shape memory material comprises Nitinol. 
     
     
       17. The device of  claim 16 , in which the first cutting basket is heat-set to a compressed state and the second cutting basket is heat-set to an expanded and uncompressed state at or above a phase transition temperature. 
     
     
       18. The device of  claim 16 , in which both the first and second cutting baskets are heat-set to an expanded state above a phase transition temperature. 
     
     
       19. The device of  claim 12 , in which the first cutting basket is stationary. 
     
     
       20. The device of  claim 12 , in which the first cutting basket is configured to rotate in a direction opposite a direction of the second cutting basket.